I assume that you have downloaded the latest "NodeXL Source Code" release from the CodePlex Downloads tab at
http://nodexl.codeplex.com/releases, and that you have followed the instructions under "To use the NodeXL source code in Visual Studio 2010." If that is the case, and you are still getting build errors,
then please copy and paste the entire text of the first error message that Visual Studio gives you when you attempt to build the solution.